EP0718283B1 - Verfahren zur Herstellung von Retinal durch Oxidation von Retinol mit Sauerstoff in Gegenwart von 4-Hydroxy-2,2,6,6-tetramethyl-piperidin-1-oxyl und Kupfer(I)-chlorid - Google Patents
Verfahren zur Herstellung von Retinal durch Oxidation von Retinol mit Sauerstoff in Gegenwart von 4-Hydroxy-2,2,6,6-tetramethyl-piperidin-1-oxyl und Kupfer(I)-chlorid Download PDFInfo
- Publication number
- EP0718283B1 EP0718283B1 EP95119979A EP95119979A EP0718283B1 EP 0718283 B1 EP0718283 B1 EP 0718283B1 EP 95119979 A EP95119979 A EP 95119979A EP 95119979 A EP95119979 A EP 95119979A EP 0718283 B1 EP0718283 B1 EP 0718283B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- retinal
- tetramethyl
- retinol
- oxygen
- copper
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
Links
- FPIPGXGPPPQFEQ-OVSJKPMPSA-N all-trans-retinol Chemical compound OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-OVSJKPMPSA-N 0.000 title claims description 18
- 230000002207 retinal effect Effects 0.000 title claims description 17
- 229910021591 Copper(I) chloride Inorganic materials 0.000 title claims description 10
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims description 10
- OXBLHERUFWYNTN-UHFFFAOYSA-M copper(I) chloride Chemical compound [Cu]Cl OXBLHERUFWYNTN-UHFFFAOYSA-M 0.000 title claims description 10
- 239000001301 oxygen Substances 0.000 title claims description 10
- 229910052760 oxygen Inorganic materials 0.000 title claims description 10
- FPIPGXGPPPQFEQ-UHFFFAOYSA-N 13-cis retinol Natural products OCC=C(C)C=CC=C(C)C=CC1=C(C)CCCC1(C)C FPIPGXGPPPQFEQ-UHFFFAOYSA-N 0.000 title claims description 9
- 238000000034 method Methods 0.000 title claims description 9
- 229960003471 retinol Drugs 0.000 title claims description 8
- 235000020944 retinol Nutrition 0.000 title claims description 8
- 239000011607 retinol Substances 0.000 title claims description 8
- 230000003647 oxidation Effects 0.000 title description 9
- 238000007254 oxidation reaction Methods 0.000 title description 9
- UZFMOKQJFYMBGY-UHFFFAOYSA-N 4-hydroxy-TEMPO Chemical group CC1(C)CC(O)CC(C)(C)N1[O] UZFMOKQJFYMBGY-UHFFFAOYSA-N 0.000 title description 6
- 238000002360 preparation method Methods 0.000 title description 3
- ZMXDDKWLCZADIW-UHFFFAOYSA-N N,N-Dimethylformamide Chemical compound CN(C)C=O ZMXDDKWLCZADIW-UHFFFAOYSA-N 0.000 claims description 15
- 239000002904 solvent Substances 0.000 claims description 6
- 125000003368 amide group Chemical group 0.000 claims description 4
- 239000007789 gas Substances 0.000 claims description 3
- FXHOOIRPVKKKFG-UHFFFAOYSA-N N,N-Dimethylacetamide Chemical compound CN(C)C(C)=O FXHOOIRPVKKKFG-UHFFFAOYSA-N 0.000 claims description 2
- SECXISVLQFMRJM-UHFFFAOYSA-N N-Methylpyrrolidone Chemical compound CN1CCCC1=O SECXISVLQFMRJM-UHFFFAOYSA-N 0.000 claims description 2
- VGGNVBNNVSIGKG-UHFFFAOYSA-N n,n,2-trimethylaziridine-1-carboxamide Chemical compound CC1CN1C(=O)N(C)C VGGNVBNNVSIGKG-UHFFFAOYSA-N 0.000 claims description 2
- ZCOGQSHZVSZAHH-UHFFFAOYSA-N n,n-dimethylaziridine-1-carboxamide Chemical compound CN(C)C(=O)N1CC1 ZCOGQSHZVSZAHH-UHFFFAOYSA-N 0.000 claims description 2
- OCUKTPXQJADNGJ-UHFFFAOYSA-N 1-(4-hydroxy-2,2,6,6-tetramethylpiperidin-1-yl)oxy-2,2,6,6-tetramethylpiperidin-4-ol Chemical compound CC1(C)CC(O)CC(C)(C)N1ON1C(C)(C)CC(O)CC1(C)C OCUKTPXQJADNGJ-UHFFFAOYSA-N 0.000 claims 2
- 230000003197 catalytic effect Effects 0.000 claims 2
- 238000004519 manufacturing process Methods 0.000 claims 1
- 230000001590 oxidative effect Effects 0.000 claims 1
- 235000020945 retinal Nutrition 0.000 description 16
- 239000011604 retinal Substances 0.000 description 16
- NCYCYZXNIZJOKI-UHFFFAOYSA-N vitamin A aldehyde Natural products O=CC=C(C)C=CC=C(C)C=CC1=C(C)CCCC1(C)C NCYCYZXNIZJOKI-UHFFFAOYSA-N 0.000 description 16
- 239000003054 catalyst Substances 0.000 description 8
- VLKZOEOYAKHREP-UHFFFAOYSA-N n-Hexane Chemical compound CCCCCC VLKZOEOYAKHREP-UHFFFAOYSA-N 0.000 description 6
- IMNFDUFMRHMDMM-UHFFFAOYSA-N N-Heptane Chemical compound CCCCCCC IMNFDUFMRHMDMM-UHFFFAOYSA-N 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 4
- -1 retinyl triphenylphosphonium salts Chemical class 0.000 description 4
- 238000003786 synthesis reaction Methods 0.000 description 4
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- YXFVVABEGXRONW-UHFFFAOYSA-N Toluene Chemical compound CC1=CC=CC=C1 YXFVVABEGXRONW-UHFFFAOYSA-N 0.000 description 3
- 230000015572 biosynthetic process Effects 0.000 description 3
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- FVAUCKIRQBBSSJ-UHFFFAOYSA-M sodium iodide Chemical compound [Na+].[I-] FVAUCKIRQBBSSJ-UHFFFAOYSA-M 0.000 description 3
- 239000000243 solution Substances 0.000 description 3
- WSGDRFHJFJRSFY-UHFFFAOYSA-N 4-oxo-TEMPO Chemical group CC1(C)CC(=O)CC(C)(C)N1[O] WSGDRFHJFJRSFY-UHFFFAOYSA-N 0.000 description 2
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 description 2
- QYTDEUPAUMOIOP-UHFFFAOYSA-N TEMPO Chemical group CC1(C)CCCC(C)(C)N1[O] QYTDEUPAUMOIOP-UHFFFAOYSA-N 0.000 description 2
- 239000007864 aqueous solution Substances 0.000 description 2
- NUJOXMJBOLGQSY-UHFFFAOYSA-N manganese dioxide Chemical compound O=[Mn]=O NUJOXMJBOLGQSY-UHFFFAOYSA-N 0.000 description 2
- 239000007800 oxidant agent Substances 0.000 description 2
- 150000004291 polyenes Chemical class 0.000 description 2
- JPVYNHNXODAKFH-UHFFFAOYSA-N Cu2+ Chemical compound [Cu+2] JPVYNHNXODAKFH-UHFFFAOYSA-N 0.000 description 1
- XDTMQSROBMDMFD-UHFFFAOYSA-N Cyclohexane Chemical compound C1CCCCC1 XDTMQSROBMDMFD-UHFFFAOYSA-N 0.000 description 1
- KCXVZYZYPLLWCC-UHFFFAOYSA-N EDTA Chemical class OC(=O)CN(CC(O)=O)CCN(CC(O)=O)CC(O)=O KCXVZYZYPLLWCC-UHFFFAOYSA-N 0.000 description 1
- 238000005684 Liebig rearrangement reaction Methods 0.000 description 1
- NCYCYZXNIZJOKI-OVSJKPMPSA-N Retinaldehyde Chemical compound O=C\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C NCYCYZXNIZJOKI-OVSJKPMPSA-N 0.000 description 1
- 238000007295 Wittig olefination reaction Methods 0.000 description 1
- OENHQHLEOONYIE-UKMVMLAPSA-N all-trans beta-carotene Natural products CC=1CCCC(C)(C)C=1/C=C/C(/C)=C/C=C/C(/C)=C/C=C/C=C(C)C=CC=C(C)C=CC1=C(C)CCCC1(C)C OENHQHLEOONYIE-UKMVMLAPSA-N 0.000 description 1
- 235000019169 all-trans-retinol Nutrition 0.000 description 1
- 239000011717 all-trans-retinol Substances 0.000 description 1
- 235000013734 beta-carotene Nutrition 0.000 description 1
- 239000011648 beta-carotene Substances 0.000 description 1
- TUPZEYHYWIEDIH-WAIFQNFQSA-N beta-carotene Natural products CC(=C/C=C/C=C(C)/C=C/C=C(C)/C=C/C1=C(C)CCCC1(C)C)C=CC=C(/C)C=CC2=CCCCC2(C)C TUPZEYHYWIEDIH-WAIFQNFQSA-N 0.000 description 1
- 229960002747 betacarotene Drugs 0.000 description 1
- 230000004071 biological effect Effects 0.000 description 1
- 235000021466 carotenoid Nutrition 0.000 description 1
- 150000001747 carotenoids Chemical class 0.000 description 1
- 239000003153 chemical reaction reagent Substances 0.000 description 1
- 238000004587 chromatography analysis Methods 0.000 description 1
- 239000003426 co-catalyst Substances 0.000 description 1
- 239000008139 complexing agent Substances 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 229910001431 copper ion Inorganic materials 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000002425 crystallisation Methods 0.000 description 1
- 230000008025 crystallization Effects 0.000 description 1
- 238000002309 gasification Methods 0.000 description 1
- GDOPTJXRTPNYNR-UHFFFAOYSA-N methyl-cyclopentane Natural products CC1CCCC1 GDOPTJXRTPNYNR-UHFFFAOYSA-N 0.000 description 1
- 238000000199 molecular distillation Methods 0.000 description 1
- 229910052759 nickel Inorganic materials 0.000 description 1
- PXHVJJICTQNCMI-UHFFFAOYSA-N nickel Substances [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 1
- 239000012074 organic phase Substances 0.000 description 1
- 238000003672 processing method Methods 0.000 description 1
- 229960000342 retinol acetate Drugs 0.000 description 1
- 235000019173 retinyl acetate Nutrition 0.000 description 1
- 239000011770 retinyl acetate Substances 0.000 description 1
- QGNJRVVDBSJHIZ-QHLGVNSISA-N retinyl acetate Chemical compound CC(=O)OC\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C QGNJRVVDBSJHIZ-QHLGVNSISA-N 0.000 description 1
- 235000009518 sodium iodide Nutrition 0.000 description 1
- 159000000000 sodium salts Chemical class 0.000 description 1
- 239000007858 starting material Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- UEUXEKPTXMALOB-UHFFFAOYSA-J tetrasodium;2-[2-[bis(carboxylatomethyl)amino]ethyl-(carboxylatomethyl)amino]acetate Chemical class [Na+].[Na+].[Na+].[Na+].[O-]C(=O)CN(CC([O-])=O)CCN(CC([O-])=O)CC([O-])=O UEUXEKPTXMALOB-UHFFFAOYSA-J 0.000 description 1
- 238000005406 washing Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
- 238000010626 work up procedure Methods 0.000 description 1
- OENHQHLEOONYIE-JLTXGRSLSA-N β-Carotene Chemical compound CC=1CCCC(C)(C)C=1\C=C\C(\C)=C\C=C\C(\C)=C\C=C\C=C(/C)\C=C\C=C(/C)\C=C\C1=C(C)CCCC1(C)C OENHQHLEOONYIE-JLTXGRSLSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C07—ORGANIC CHEMISTRY
- C07C—ACYCLIC OR CARBOCYCLIC COMPOUNDS
- C07C403/00—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone
- C07C403/14—Derivatives of cyclohexane or of a cyclohexene or of cyclohexadiene, having a side-chain containing an acyclic unsaturated part of at least four carbon atoms, this part being directly attached to the cyclohexane or cyclohexene or cyclohexadiene rings, e.g. vitamin A, beta-carotene, beta-ionone having side-chains substituted by doubly-bound oxygen atoms
Definitions
- the invention relates to an improved process for the preparation of retinal (vitamin A aldehyde) of the formula I. by oxidation of retinol with oxygen in the presence of 4-hydroxy-2,2,6,6-tetramethyl-piperidine-1-oxyl and copper (I) chloride.
- Retinal has valuable biological activity or is a building block to represent important carotenoids. So can from retinal by Wittig olefination with retinyl triphenylphosphonium salts the wished ⁇ -carotene can be produced (DE 10 68 709). Outgoing of retinal are also syntheses in the feed and Food sector sought after beta-apocarotenoids possible (Pure Appl. Chem. (1991), pp. 45-58 and Liebigs Ann. Chem. (1976), Pp. 2194-2205).
- the oxidizing agent has very special requirements posed.
- suitable reagents for oxidation are Metal oxides such as manganese dioxide or nickel peroxide are described. Disadvantages of the mostly heterogeneous metal oxides are strongly fluctuating yields (Chem. Rev. 67 (1967), p. 188), the required a large excess of oxidizing agent (J. Chem. Soc. (1952), p. 1094) and the need to activate the Metal oxides.
- retinal can be used with much smaller amount of catalyst and with significantly higher Yields can be gained if one retinal in the presence of Catalyst system 4-hydroxy-2,2,6,6-tetramethyl-piperidine-1-oxyl and copper (I) chloride in a solvent containing amide groups oxidized with oxygen or a gas containing oxygen.
- the starting compound retinol (vitamin A alcohol) is on an industrial scale available as an intermediate in vitamin A acetate synthesis.
- Solvents containing amide groups are preferred N, N-dimethylacetamide, 1-methyl-2-pyrrolidone, N, N-dimethylpropylene urea or N, N-dimethylethylene urea and above all N, N-dimethylformamide into consideration.
- Both this catalyst and the co-catalyst Cu (I) Cl are usually used in amounts of 2 to 5 mol%. Larger quantities do not harm, but are used Larger amounts no longer increase the yields.
- the relationship of 4-hydroxy-2,2,6,6-tetramethyl-piperidine-1-oxyl to CuCl usually 1: 1 to 1: 3.
- the process is advantageously carried out so that retinol together with the catalyst system in the solvent, preferably in dimethylformamide, is submitted and by gasification of Oxygen or gases containing oxygen is oxidized.
- the reaction temperature is preferably 20 to 40 ° C, particularly preferably 25 to 35 ° C.
- the response times are 0.5 to 6 hours, preferably 1 to 4 hours.
- a wash with diluted can be particularly advantageous aqueous solutions of complexing agents, such as sodium salts of Ethylenediaminetetraacetic acid.
- the oxidation yields are generally 95 to 99%; the yields of pure crystalline retinal depending on the processing method 80 to 95%.
- the homogeneous product solution was worked up with heptane, Extracted hexane, cyclohexane or toluene.
Landscapes
- Chemical & Material Sciences (AREA)
- Organic Chemistry (AREA)
- Organic Low-Molecular-Weight Compounds And Preparation Thereof (AREA)
- Low-Molecular Organic Synthesis Reactions Using Catalysts (AREA)
Description
| Tabelle zu Beispiel 1: | |||||
| Retinal [Mol] | 4-OH-TEMPO [Mol] | CuCl [Mol] | Reaktionszeit [h] | Oxidationsausbeute [%] | Ausbeute [%, gereinigt] |
| 10 | 0,2 | 0,2 | 6 | 95 | 81 |
| 10 | 0,3 | 0,3 | 3 | 98 | 84 |
| 10 | 0,3 | 0,4 | 3 | >98 | 88 |
| 10 | 0,35 | 0,5 | 2 | >99 | 88 |
| 10 | 0,5 | 0,5 | 2 | >99 | 90 |
Claims (5)
- Verfahren zur Herstellung von Retinal, dadurch gekennzeichnet, daß man Retinol in homogener Phase in einem Amidgruppen enthaltenden Lösungsmittel mit katalytischen Mengen 4-Hydroxy-2,2,6,6-tetramethyl-piperidin-1-oxyl und katalytischen Mengen Kupfer(I)-chlorid mit Sauerstoff oder sauerstoffhaltigen Gasen oxidiert.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das 4-Hydroxy-2,2,6,6-tetramethyl-piperidin-1-oxyl in Mengen von 2 bis 5 Mol-%, bezogen auf Retinol einsetzt.
- Verfahren nach Anspruch 1, dadurch gekennzeichnet, daß man das Kupfer(I)-chlorid in Mengen von 2 bis 5 Mol-%, bezogen auf Retinol einsetzt.
- Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß man als Amidgruppen enthaltendes Lösungsmittel N,N-Dimethylformamid, N,N-Dimethyl-acetamid, 1-Methyl-2-pyrrolidon, N,N-Dimethyl-propylenharnstoff oder N,N-Dimethyl-ethylenharnstoff verwendet.
- Verfahren gemäß Anspruch 1, dadurch gekennzeichnet, daß man als Lösungsmittel Dimethylformamid verwendet.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| DE4446451A DE4446451A1 (de) | 1994-12-23 | 1994-12-23 | Verfahren zur Herstellung von Retinal durch Oxidation von Retinol mit Sauerstoff in Gegenwart von 4-Hydroxy-2,2,6,6-tetramethyl-piperidin-1-oxyl und Kupfer(I)-chlorid |
| DE4446451 | 1994-12-23 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| EP0718283A1 EP0718283A1 (de) | 1996-06-26 |
| EP0718283B1 true EP0718283B1 (de) | 1998-08-19 |
Family
ID=6537016
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| EP95119979A Expired - Lifetime EP0718283B1 (de) | 1994-12-23 | 1995-12-18 | Verfahren zur Herstellung von Retinal durch Oxidation von Retinol mit Sauerstoff in Gegenwart von 4-Hydroxy-2,2,6,6-tetramethyl-piperidin-1-oxyl und Kupfer(I)-chlorid |
Country Status (2)
| Country | Link |
|---|---|
| EP (1) | EP0718283B1 (de) |
| DE (2) | DE4446451A1 (de) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| NL1009606C2 (nl) * | 1998-07-10 | 2000-01-11 | Univ Delft Tech | Werkwijze voor het oxyderen van een alcohol. |
| DE10112067A1 (de) | 2001-03-12 | 2002-09-19 | Basf Ag | Verfahren zur Herstellung von 2,7-Dimethyl-2,4,6-octarienal-monoacetalen |
| CN113880742B (zh) * | 2021-09-29 | 2023-08-11 | 无锡桑格尔生物科技有限公司 | 一种维生素a及其衍生物的制备方法 |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0157738B1 (de) * | 1984-03-22 | 1989-04-19 | Ciba-Geigy Ag | Verfahren zur Herstellung von Nitroxylen sterisch gehinderter Amine |
| DE3705785A1 (de) * | 1987-02-24 | 1988-09-01 | Basf Ag | Verfahren zur herstellung von polyenaldehyden |
-
1994
- 1994-12-23 DE DE4446451A patent/DE4446451A1/de not_active Withdrawn
-
1995
- 1995-12-18 EP EP95119979A patent/EP0718283B1/de not_active Expired - Lifetime
- 1995-12-18 DE DE59503261T patent/DE59503261D1/de not_active Expired - Lifetime
Also Published As
| Publication number | Publication date |
|---|---|
| DE4446451A1 (de) | 1996-06-27 |
| DE59503261D1 (de) | 1998-09-24 |
| EP0718283A1 (de) | 1996-06-26 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| DE3112213A1 (de) | Verfahren zur herstellung von n-octadienol | |
| DE3205464A1 (de) | Verfahren zur herstellung von n-octanol | |
| EP0304763A1 (de) | Verfahren zur Herstellung von Ethercarbonsäuren | |
| DE2437133B2 (de) | Verfahren zur Carboxylierung von aliphatischen Alkoholen | |
| EP0987239A1 (de) | Verfahren zur Synthese alpha-substituierter Ringsysteme | |
| EP0282760B1 (de) | Verfahren zur Herstellung von Polyenaldehyden | |
| EP0718283B1 (de) | Verfahren zur Herstellung von Retinal durch Oxidation von Retinol mit Sauerstoff in Gegenwart von 4-Hydroxy-2,2,6,6-tetramethyl-piperidin-1-oxyl und Kupfer(I)-chlorid | |
| DE4333642C2 (de) | Verfahren zur Herstellung von 2-Alkyl-5-formylimidazolen | |
| EP0700892B1 (de) | Verfahren zur Herstellung von Mono- oder Dicarbonsäuren aus Aldehyden, deren Vollacetalen oder Halbacetalen, sowie aus Gemischen davon | |
| CH712810B1 (de) | Verfahren zur Herstellung einer 4-(Trifluormethylsulfonyl)phenol-Verbindung. | |
| EP1169281A1 (de) | Singlet sauerstoff oxidation von organischen substraten | |
| DE3108602C2 (de) | Verfahren zur selektiven Herstellung von eine Perfluorkohlenstoffgruppe enthaltenden Aldehyden | |
| DE2949847C2 (de) | ||
| DE2702088C2 (de) | Verfahren zur Autoxidation eines Cycloalkanons zu dem entsprechenden Cycloalkan-1,2-dion | |
| DE69503106T2 (de) | Verfahren zur Herstellung von L-Ascorbinsäure | |
| DE60317626T2 (de) | Verfahren zur herstellung von 2,5-bis(trifluormethyl)nitrobenzol | |
| EP0036651B1 (de) | Verfahren zur Herstellung von 3-Oxo-alpha-jonon | |
| DE2642672A1 (de) | Selektive oxidation von chrysanthemylalkohol | |
| DE2460665C2 (de) | Verfahren zur Herstellung von p-Chinonen | |
| DE112005003520T5 (de) | Verfahren zur Herstellung von p-Toluolsäure durch Flüssigphasenoxidation von p-Xylol in Wasser | |
| AT502537B1 (de) | Verfahren zur oxidation von organischen substraten mittels singlet sauerstoff bei hohen reaktionstemperaturen | |
| DE2804115A1 (de) | Verfahren zur oxidation von alkarylverbindungen | |
| DE2037189A1 (de) | Verfahren zur Herstellung einer ah phatischen alpha, omega Dicarbonsaure | |
| EP2776447B1 (de) | Verfahren zur herstellung von oxovinyljonol und dessen o-geschützten derivaten | |
| EP1279657B1 (de) | Verfahren zur Herstellung von Carbonylverbindungen aus Alkoholen |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PUAI | Public reference made under article 153(3) epc to a published international application that has entered the european phase |
Free format text: ORIGINAL CODE: 0009012 |
|
| AK | Designated contracting states |
Kind code of ref document: A1 Designated state(s): CH DE FR GB LI |
|
| 17P | Request for examination filed |
Effective date: 19960710 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| 17Q | First examination report despatched |
Effective date: 19971222 |
|
| GRAG | Despatch of communication of intention to grant |
Free format text: ORIGINAL CODE: EPIDOS AGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAH | Despatch of communication of intention to grant a patent |
Free format text: ORIGINAL CODE: EPIDOS IGRA |
|
| GRAA | (expected) grant |
Free format text: ORIGINAL CODE: 0009210 |
|
| AK | Designated contracting states |
Kind code of ref document: B1 Designated state(s): CH DE FR GB LI |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: EP |
|
| GBT | Gb: translation of ep patent filed (gb section 77(6)(a)/1977) |
Effective date: 19980902 |
|
| REF | Corresponds to: |
Ref document number: 59503261 Country of ref document: DE Date of ref document: 19980924 |
|
| ET | Fr: translation filed | ||
| PLBE | No opposition filed within time limit |
Free format text: ORIGINAL CODE: 0009261 |
|
| STAA | Information on the status of an ep patent application or granted ep patent |
Free format text: STATUS: NO OPPOSITION FILED WITHIN TIME LIMIT |
|
| 26N | No opposition filed | ||
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: IF02 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: GB Payment date: 20141230 Year of fee payment: 20 Ref country code: CH Payment date: 20141222 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: DE Payment date: 20150227 Year of fee payment: 20 |
|
| PGFP | Annual fee paid to national office [announced via postgrant information from national office to epo] |
Ref country code: FR Payment date: 20141230 Year of fee payment: 20 |
|
| REG | Reference to a national code |
Ref country code: DE Ref legal event code: R071 Ref document number: 59503261 Country of ref document: DE |
|
| REG | Reference to a national code |
Ref country code: CH Ref legal event code: PL |
|
| REG | Reference to a national code |
Ref country code: GB Ref legal event code: PE20 Expiry date: 20151217 |
|
| PG25 | Lapsed in a contracting state [announced via postgrant information from national office to epo] |
Ref country code: GB Free format text: LAPSE BECAUSE OF EXPIRATION OF PROTECTION Effective date: 20151217 |
